package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.common.constant.MessageConstant;
import com.sky.common.exception.BusinessException;
import com.sky.common.properties.WeChatProperties;
import com.sky.common.utils.HttpClientUtil;
import com.sky.mapper.UserMapper;
import com.sky.pojo.dto.UserLoginDTO;
import com.sky.pojo.entity.User;
import com.sky.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Slf4j
@Service
public class UserServiceImpl implements UserService {

    //微信登录接口地址
    public static final String WEXIN_LOGIN_URL="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    @Override
    public User login(UserLoginDTO userLoginDTO) {
        //1. 调用微信接口 (HttpClient),  实现登录操作
        Map<String, String> paramMap = new HashMap<>();
        paramMap.put("appid", weChatProperties.getAppid());
        paramMap.put("secret", weChatProperties.getSecret());
        paramMap.put("js_code", userLoginDTO.getCode());
        paramMap.put("grant_type", "authorization_code");

        String result = HttpClientUtil.doGet(WEXIN_LOGIN_URL, paramMap);
        log.info("微信登录完成, 结果: {}", result);
        if (!StringUtils.hasLength(result)){
            throw new BusinessException(MessageConstant.LOGIN_FAILED);
        }

        JSONObject jsonObject = JSON.parseObject(result);
        String openid = jsonObject.getString("openid"); //微信用户唯一标识
        if (!StringUtils.hasLength(openid)){
            throw new BusinessException(MessageConstant.LOGIN_FAILED);
        }

        //2. 如果用户是第一次访问小程序, 则需要完成自动注册(insert)功能
        User user = userMapper.selectByOpenid(openid);
        if (user == null){
            user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);
        }

        //3. 返回
        return user;
    }

}
